在项目中使用消息队列一般是有如下几个原因:
1.把瞬间服务器的请求处理换成异步处理,缓解服务器的压力
2.实现数据顺序排列获取
redis实现消息队列步骤如下:
1)redis函数rpush,lpop
2)建议定时任务入队列
3)创建定时任务出队列
文件:demo.php插入数据到redis队列
<?php
$redis = new Redis();
$redis->connect('127.0.0.1',6379);
$password = '123456';
$redis->auth($password);
$arr = array('h','e','l','l','o','w','o','r','l','d');
foreach($arr as $k=>$v){
$redis->rpush("mylist",$v);
}
文件:index.php定时扫描出队列
<?php
$redis = new Redis();
$redis->connect('127.0.0.1',6379);
$password = '123456';
$redis->auth($password);
//list类型出队操作
$value = $redis->lpop('mylist');
if($value){
echo "出队的值".$value;
}else{
echo "出队完成";
}
?>
建立定时任务:
*/1 * * * * root php /wwwroot/workplace/redis/index.php
*/3 * * * * root php /wwwroot/workplace/redis/demo.php
tail -f /var/log/cron 查看定时任务执行情况
Nov 7 00:30:01 dongzi CROND[6888]: (root) CMD (php /wwwroot/workplace/redis/demo.php)
Nov 7 00:30:01 dongzi CROND[6890]: (root) CMD (php /wwwroot/workplace/redis/index.php )
定时任务执行队列写入结果如下
127.0.0.1:6379> lrange mylist 0 -1
1) "h"
2) "e"
3) "l"
4) "l"
5) "o"
6) "w"
7) "o"
8) "r"
9) "l"
10) "d"
定时任务执行出队列后:
127.0.0.1:6379> lrange mylist 0 -1
1) "e"
2) "l"
3) "l"
4) "o"
5) "w"
6) "o"
7) "r"
8) "l"
9) "d"